Find All the Real Zeros of F(x) = 3x³ - $- \frac { 1 } { 3 }$

Multiple Choice

Find all the real zeros of f(x) = 3x³ - 9x² + 3x - 9.

A) x = 3
B) x = 3, $- \frac { 1 } { 3 }$
C) x = $\frac { 1 } { 3 }$ , $- \frac { 1 } { 9 }$
D) x = ±1, 3
E) x = 3, 1, -9